package com.uliky.shouyiLibrary.cart.interceptor;

import com.uliky.common.constant.AuthServerConstant;
import com.uliky.common.constant.CartConstant;
import com.uliky.common.vo.MemberRespVo;
import com.uliky.shouyiLibrary.cart.vo.UserInfoTo;
import org.apache.commons.lang.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * 在执行目标方法之前，判断用户登陆状态，并封装给controller
 */
public class CartInterceptor implements HandlerInterceptor {
    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();
    /**
     * 目标方法执行之前执行
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();
        HttpSession session = request.getSession();
        MemberRespVo member = (MemberRespVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if(member!=null) {
            //用户已经登录
            userInfoTo.setUserId(member.getId());
        }
        Cookie[] cookies = request.getCookies();
        if(cookies!=null && cookies.length > 0) {
            for (Cookie cookie : cookies) {
                String name = cookie.getName();
                if(name.equals(CartConstant.TEMP_USER_COOKIE_NAME)) {
                    //已经分配了cookie
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTempUser(true);
                }
            }
        }
        //为临时用户分配user_key
        if(StringUtils.isEmpty(userInfoTo.getUserKey())) {
            String uuid = UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);

        }
        //将信息封装到threadLocal中，实现线程共享
        threadLocal.set(userInfoTo);
        return true;
    }

    /**
     * 方法执行结束，让浏览器保存cookies
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();
        if(!userInfoTo.isTempUser()) {
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
            //作用域
            cookie.setDomain("shouyiLibrary.com");
            //过期时间
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIME_OUT);
            response.addCookie(cookie);
        }
//        threadLocal.remove();
    }
}
